9

980 Glossary
Nor mal
The normal of each face can point in a different direction.
Anormalisavectorthatdefineswhichwayaface
or vertex is pointing. The direction of the normal
indicates the front, or outer surface of the face or
vertex.
You can manually flip or unif y face normals to fix
surfaceerrorscausedbymodelingoperationsor
byimportingmeshesfromotherprograms.
See also
Normal modifier (page 1–746)
NTS C
NTSC (National Television Standards Committee)
is the name of the video standard used in North
America, most of Central and South Amer ica, and
Japan. The frame rate is 30 frames per second
(fps) or 6 0 fields (page 3–938) per second, w ith
each field accounting for half the interleaved scan
lines on a telev ision screen.
NUR B S
Fountain basin modeled as a NURBS surface
NURBS (Non-Uniform Rational B-Splines) are
a technique for interactively mo deling 3D curves
and surfaces.
NUR B S Cur ve
AcurveobjectcreatedbyNURBS modeling (page
3–980). NURBS Curves can be either Point Curves
or CV Curves. You can use them as you do spline
curves in Shape objects.
NUR B S Mod el
Fountain modeled using NURBS surfaces